40819978 has 4 divisors (see below), whose sum is σ = 61229970. Its totient is φ = 20409988.

The previous prime is 40819973. The next prime is 40819979. The reversal of 40819978 is 87991804.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28869129 + 11950849 = 5373^2 + 3457^2 .

It is not an unprimeable number, because it can be changed into a prime (40819973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204993 + ... + 10204996.

Almost surely, 2^40819978 is an apocalyptic number.

40819978 is a deficient number, since it is larger than the sum of its proper divisors (20409992).

40819978 is a wasteful number, since it uses less digits than its factorization.

40819978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20409991.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 40819978 is about 6389.0514162902. The cubic root of 40819978 is about 344.3163047540.

The spelling of 40819978 in words is "forty million, eight hundred nineteen thousand, nine hundred seventy-eight".